The penis is supplied by the following three pairs of arteries that are all branches of the common penile artery that is a branch of the internal pudendal artery (a branch of the internal iliac artery):

Bulbar artery (also known as the artery of bulb of penis, or bulbourethral artery)
Deep artery of penis
Dorsal artery of penis

The venous drainage is provided by veins that accompany the arteries mentioned above. All these veins drain into the internal pudendal vein.

The scrotum is supplied by the following arterial blood vessels:

Anterior scrotal branches of the external pudendal artery (originating from the femoral artery)
Posterior scrotal branches of the perineal artery (arises from the internal pudendal artery)
Cremasteric artery arising from the inferior epigastric artery

The scrotum is drained via superficial and deep venous networks. Superficial venous network mostly drains into the external pudendal vein, while deep venous network into the internal pudendal veins.

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Blood supply of male external genital organs